Power distribution device between an electric starter and an electric machine towards a shaft of a turbomachine

Abstract

A power distribution device between an electric starter of a turbomachine and an electric machine toward a shaft of the turbomachine, including the electric starter, the electric machine, and a controller for controlling the electric machine. An epicyclic train reducer includes a first element intended to be coupled to the shaft, a second element coupled to the electric starter, and a third element intended to be rotated by the electric machine. The controller is configured to rotate the third of the three elements so as to obtain two bearings of reduction ratios of the speeds between the first of said three elements and the second of the three elements. The controller is configured to drive the torque of the third of the three elements in accordance with a determined output torque.

The invention claimed is: 
     
       1. A power distribution device between an electric starter of a turbomachine and an electric machine toward a high pressure shaft of the turbomachine, comprising:
 the electric starter, 
 the electric machine, 
 means for controlling the speed of said electric machine, 
 an epicyclic train reducer comprising three elements, a central sun gear, an outer ring gear and a planet carrier whose planet gears mesh with said sun gear and said ring gear, said three elements being rotatable about an axis of the reducer, a first of said three elements being intended to be coupled to the high pressure shaft, a second of said three elements being coupled to the electric starter, a third of said three elements being intended to be driven in rotation by the electric machine, 
 wherein the controlling means are configured to rotate the third of said three elements so as to obtain two bearings of reduction ratios of the speeds between the first of said three elements and the second of said three elements, 
 and wherein the controlling means are configured to drive the torque of the third of said three elements in accordance with a determined output torque. 
 
     
     
       2. The power distribution device according to  claim 1 , comprising at least one inverter arranged upstream of the electric starter and the electric machine. 
     
     
       3. The power distribution device according to  claim 1 , wherein the first of said three elements is the planet carrier, the second of said three elements is the sun gear, and the third of said three elements is the ring gear. 
     
     
       4. The power distribution device according to  claim 1 , wherein the first of said three elements is the planet carrier, the second of said three elements is the ring gear, and the third of said three elements is the sun gear. 
     
     
       5. An aircraft turbomachine comprising a shaft and a power distribution device according to  claim 1 , and wherein the first of said three elements is coupled to the shaft. 
     
     
       6. The turbomachine according to  claim 5 , wherein the shaft is a high pressure shaft. 
     
     
       7. A method of regulating the speed of an electric machine of a power distribution device, according to  claim 1 , in a turbomachine of an aircraft, comprising a step of modifying the speed of the third of the three elements by driving the electric machine by controlling means so as to obtain two bearings of reduction ratios of the speeds between the first of said three elements and the second of said three elements, and a step of driving the torque of the third of said three elements as a function of a determined output torque.